1. Ph.D. Graduate, Dept. of Systems Engineering and Engineering Management, City Univ. of Hong Kong, 83 Tat Chee Ave., Kowloon Tong, Hong Kong (corresponding author).
2. Associate Professor, Dept. of Systems Engineering and Engineering Management, City Univ. of Hong Kong, 83 Tat Chee Ave., Kowloon Tong, Hong Kong.